src/common/init.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/init.cpp
   3 // Purpose:     initialisation for the library
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04.10.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef    __BORLANDC__
  23     #pragma hdrstop
  24 #endif  //__BORLANDC__
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/app.h"
  28     #include "wx/filefn.h"
  29     #include "wx/log.h"
  30     #include "wx/intl.h"
  31     #include "wx/module.h"
  32 #endif
  33
  34 #include "wx/init.h"
  35 #include "wx/thread.h"
  36
  37 #include "wx/ptr_scpd.h"
  38 #include "wx/except.h"
  39
  40 #if defined(__WXMSW__) && defined(__WXDEBUG__)
  41     #include "wx/msw/msvcrt.h"
  42
  43     static struct EnableMemLeakChecking
  44     {
  45         EnableMemLeakChecking()
  46         {
  47             // do check for memory leaks on program exit (another useful flag
  48             // is _CRTDBG_DELAY_FREE_MEM_DF which doesn't free deallocated
  49             // memory which may be used to simulate low-memory condition)
  50             wxCrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF);
  51         }
  52     } gs_enableLeakChecks;
  53 #endif // __WXMSW__ && __WXDEBUG__
  54
  55 // ----------------------------------------------------------------------------
  56 // private classes
  57 // ----------------------------------------------------------------------------
  58
  59 // we need a dummy app object if the user doesn't want to create a real one
  60 class wxDummyConsoleApp : public wxAppConsole
  61 {
  62 public:
  63     wxDummyConsoleApp() { }
  64
  65     virtual int OnRun() { wxFAIL_MSG( _T("unreachable code") ); return 0; }
  66
  67     DECLARE_NO_COPY_CLASS(wxDummyConsoleApp)
  68 };
  69
  70 // we need a special kind of auto pointer to wxApp which not only deletes the
  71 // pointer it holds in its dtor but also resets the global application pointer
  72 wxDECLARE_SCOPED_PTR(wxAppConsole, wxAppPtrBase)
  73 wxDEFINE_SCOPED_PTR(wxAppConsole, wxAppPtrBase)
  74
  75 class wxAppPtr : public wxAppPtrBase
  76 {
  77 public:
  78     wxEXPLICIT wxAppPtr(wxAppConsole *ptr = NULL) : wxAppPtrBase(ptr) { }
  79     ~wxAppPtr()
  80     {
  81         if ( get() )
  82         {
  83             // the pointer is going to be deleted in the base class dtor, don't
  84             // leave the dangling pointer!
  85             wxApp::SetInstance(NULL);
  86         }
  87     }
  88
  89     void Set(wxAppConsole *ptr)
  90     {
  91         reset(ptr);
  92
  93         wxApp::SetInstance(ptr);
  94     }
  95
  96     DECLARE_NO_COPY_CLASS(wxAppPtr)
  97 };
  98
  99 // class to ensure that wxAppBase::CleanUp() is called if our Initialize()
 100 // fails
 101 class wxCallAppCleanup
 102 {
 103 public:
 104     wxCallAppCleanup(wxAppConsole *app) : m_app(app) { }
 105     ~wxCallAppCleanup() { if ( m_app ) m_app->CleanUp(); }
 106
 107     void Dismiss() { m_app = NULL; }
 108
 109 private:
 110     wxAppConsole *m_app;
 111 };
 112
 113 // another tiny class which simply exists to ensure that wxEntryCleanup is
 114 // always called
 115 class wxCleanupOnExit
 116 {
 117 public:
 118     ~wxCleanupOnExit() { wxEntryCleanup(); }
 119 };
 120
 121 // ----------------------------------------------------------------------------
 122 // private functions
 123 // ----------------------------------------------------------------------------
 124
 125 // suppress warnings about unused variables
 126 static inline void Use(void *) { }
 127
 128 #define WX_SUPPRESS_UNUSED_WARN(x) Use(&x)
 129
 130 // ----------------------------------------------------------------------------
 131 // initialization data
 132 // ----------------------------------------------------------------------------
 133
 134 static struct InitData
 135 {
 136     InitData()
 137     {
 138         nInitCount = 0;
 139
 140 #if wxUSE_UNICODE
 141         argc = 0;
 142         // argv = NULL; -- not even really needed
 143 #endif // wxUSE_UNICODE
 144     }
 145
 146     // critical section protecting this struct
 147     wxCRIT_SECT_DECLARE_MEMBER(csInit);
 148
 149     // number of times wxInitialize() was called minus the number of times
 150     // wxUninitialize() was
 151     size_t nInitCount;
 152
 153 #if wxUSE_UNICODE
 154     int argc;
 155
 156     // if we receive the command line arguments as ASCII and have to convert
 157     // them to Unicode ourselves (this is the case under Unix but not Windows,
 158     // for example), we remember the converted argv here because we'll have to
 159     // free it when doing cleanup to avoid memory leaks
 160     wchar_t **argv;
 161 #endif // wxUSE_UNICODE
 162
 163     DECLARE_NO_COPY_CLASS(InitData)
 164 } gs_initData;
 165
 166 // ============================================================================
 167 // implementation
 168 // ============================================================================
 169
 170 // ----------------------------------------------------------------------------
 171 // command line arguments ANSI -> Unicode conversion
 172 // ----------------------------------------------------------------------------
 173
 174 #if wxUSE_UNICODE
 175
 176 static void ConvertArgsToUnicode(int argc, char **argv)
 177 {
 178     gs_initData.argv = new wchar_t *[argc + 1];
 179     int wargc = 0;
 180     for ( int i = 0; i < argc; i++ )
 181     {
 182 #ifdef __DARWIN__
 183         wxWCharBuffer buf(wxConvFileName->cMB2WX(argv[i]));
 184 #else
 185         wxWCharBuffer buf(wxConvLocal.cMB2WX(argv[i]));
 186 #endif
 187         if ( !buf )
 188         {
 189             wxLogWarning(_("Command line argument %d couldn't be converted to Unicode and will be ignored."),
 190                          i);
 191         }
 192         else // converted ok
 193         {
 194             gs_initData.argv[wargc++] = wxStrdup(buf);
 195         }
 196     }
 197
 198     gs_initData.argc = wargc;
 199     gs_initData.argv[wargc] = NULL;
 200 }
 201
 202 static void FreeConvertedArgs()
 203 {
 204     if ( gs_initData.argv )
 205     {
 206         for ( int i = 0; i < gs_initData.argc; i++ )
 207         {
 208             free(gs_initData.argv[i]);
 209         }
 210
 211         delete [] gs_initData.argv;
 212         gs_initData.argv = NULL;
 213         gs_initData.argc = 0;
 214     }
 215 }
 216
 217 #endif // wxUSE_UNICODE
 218
 219 // ----------------------------------------------------------------------------
 220 // start up
 221 // ----------------------------------------------------------------------------
 222
 223 // initialization which is always done (not customizable) before wxApp creation
 224 static bool DoCommonPreInit()
 225 {
 226 #if wxUSE_LOG
 227     // Reset logging in case we were cleaned up and are being reinitialized.
 228     wxLog::DoCreateOnDemand();
 229
 230     // install temporary log sink: we can't use wxLogGui before wxApp is
 231     // constructed and if we use wxLogStderr, all messages during
 232     // initialization simply disappear under Windows
 233     //
 234     // note that we will delete this log target below
 235     delete wxLog::SetActiveTarget(new wxLogBuffer);
 236 #endif // wxUSE_LOG
 237
 238     return true;
 239 }
 240
 241 // non customizable initialization done after wxApp creation and initialization
 242 static bool DoCommonPostInit()
 243 {
 244     wxModule::RegisterModules();
 245
 246     if ( !wxModule::InitializeModules() )
 247     {
 248         wxLogError(_("Initialization failed in post init, aborting."));
 249         return false;
 250     }
 251
 252     return true;
 253 }
 254
 255 bool wxEntryStart(int& argc, wxChar **argv)
 256 {
 257     // do minimal, always necessary, initialization
 258     // --------------------------------------------
 259
 260     // initialize wxRTTI
 261     if ( !DoCommonPreInit() )
 262     {
 263         return false;
 264     }
 265
 266
 267     // first of all, we need an application object
 268     // -------------------------------------------
 269
 270     // the user might have already created it himself somehow
 271     wxAppPtr app(wxTheApp);
 272     if ( !app.get() )
 273     {
 274         // if not, he might have used IMPLEMENT_APP() to give us a function to
 275         // create it
 276         wxAppInitializerFunction fnCreate = wxApp::GetInitializerFunction();
 277
 278         if ( fnCreate )
 279         {
 280             // he did, try to create the custom wxApp object
 281             app.Set((*fnCreate)());
 282         }
 283     }
 284
 285     if ( !app.get() )
 286     {
 287         // either IMPLEMENT_APP() was not used at all or it failed -- in any
 288         // case we still need something
 289         app.Set(new wxDummyConsoleApp);
 290     }
 291
 292
 293     // wxApp initialization: this can be customized
 294     // --------------------------------------------
 295
 296     if ( !app->Initialize(argc, argv) )
 297     {
 298         return false;
 299     }
 300
 301     // remember, possibly modified (e.g. due to removal of toolkit-specific
 302     // parameters), command line arguments in member variables
 303     app->argc = argc;
 304     app->argv = argv;
 305
 306
 307     wxCallAppCleanup callAppCleanup(app.get());
 308
 309     // for compatibility call the old initialization function too
 310     if ( !app->OnInitGui() )
 311         return false;
 312
 313
 314     // common initialization after wxTheApp creation
 315     // ---------------------------------------------
 316
 317     if ( !DoCommonPostInit() )
 318         return false;
 319
 320
 321     // prevent the smart pointer from destroying its contents
 322     app.release();
 323
 324     // and the cleanup object from doing cleanup
 325     callAppCleanup.Dismiss();
 326
 327 #if wxUSE_LOG
 328     // now that we have a valid wxApp (wxLogGui would have crashed if we used
 329     // it before now), we can delete the temporary sink we had created for the
 330     // initialization messages -- the next time logging function is called, the
 331     // sink will be recreated but this time wxAppTraits will be used
 332     delete wxLog::SetActiveTarget(NULL);
 333 #endif // wxUSE_LOG
 334
 335     return true;
 336 }
 337
 338 #if wxUSE_UNICODE
 339
 340 // we provide a wxEntryStart() wrapper taking "char *" pointer too
 341 bool wxEntryStart(int& argc, char **argv)
 342 {
 343     ConvertArgsToUnicode(argc, argv);
 344
 345     if ( !wxEntryStart(gs_initData.argc, gs_initData.argv) )
 346     {
 347         FreeConvertedArgs();
 348
 349         return false;
 350     }
 351
 352     return true;
 353 }
 354
 355 #endif // wxUSE_UNICODE
 356
 357 // ----------------------------------------------------------------------------
 358 // clean up
 359 // ----------------------------------------------------------------------------
 360
 361 // cleanup done before destroying wxTheApp
 362 static void DoCommonPreCleanup()
 363 {
 364 #if wxUSE_LOG
 365     // flush the logged messages if any and install a 'safer' log target: the
 366     // default one (wxLogGui) can't be used after the resources are freed just
 367     // below and the user supplied one might be even more unsafe (using any
 368     // wxWidgets GUI function is unsafe starting from now)
 369     wxLog::DontCreateOnDemand();
 370
 371     // this will flush the old messages if any
 372     delete wxLog::SetActiveTarget(new wxLogStderr);
 373 #endif // wxUSE_LOG
 374 }
 375
 376 // cleanup done after destroying wxTheApp
 377 static void DoCommonPostCleanup()
 378 {
 379     wxModule::CleanUpModules();
 380
 381     // we can't do this in wxApp itself because it doesn't know if argv had
 382     // been allocated
 383 #if wxUSE_UNICODE
 384     FreeConvertedArgs();
 385 #endif // wxUSE_UNICODE
 386
 387     // use Set(NULL) and not Get() to avoid creating a message output object on
 388     // demand when we just want to delete it
 389     delete wxMessageOutput::Set(NULL);
 390
 391 #if wxUSE_LOG
 392     // and now delete the last logger as well
 393     delete wxLog::SetActiveTarget(NULL);
 394 #endif // wxUSE_LOG
 395 }
 396
 397 void wxEntryCleanup()
 398 {
 399     DoCommonPreCleanup();
 400
 401
 402     // delete the application object
 403     if ( wxTheApp )
 404     {
 405         wxTheApp->CleanUp();
 406
 407         // reset the global pointer to it to NULL before destroying it as in
 408         // some circumstances this can result in executing the code using
 409         // wxTheApp and using half-destroyed object is no good
 410         wxAppConsole * const app = wxApp::GetInstance();
 411         wxApp::SetInstance(NULL);
 412         delete app;
 413     }
 414
 415
 416     DoCommonPostCleanup();
 417 }
 418
 419 // ----------------------------------------------------------------------------
 420 // wxEntry
 421 // ----------------------------------------------------------------------------
 422
 423 // for MSW the real wxEntry is defined in msw/main.cpp
 424 #ifndef __WXMSW__
 425     #define wxEntryReal wxEntry
 426 #endif // !__WXMSW__
 427
 428 int wxEntryReal(int& argc, wxChar **argv)
 429 {
 430     // library initialization
 431     if ( !wxEntryStart(argc, argv) )
 432     {
 433 #if wxUSE_LOG
 434         // flush any log messages explaining why we failed
 435         delete wxLog::SetActiveTarget(NULL);
 436 #endif
 437         return -1;
 438     }
 439
 440     // if wxEntryStart succeeded, we must call wxEntryCleanup even if the code
 441     // below returns or throws
 442     wxCleanupOnExit cleanupOnExit;
 443
 444     WX_SUPPRESS_UNUSED_WARN(cleanupOnExit);
 445
 446     wxTRY
 447     {
 448
 449         // app initialization
 450         if ( !wxTheApp->CallOnInit() )
 451         {
 452             // don't call OnExit() if OnInit() failed
 453             return -1;
 454         }
 455
 456         // ensure that OnExit() is called if OnInit() had succeeded
 457         class CallOnExit
 458         {
 459         public:
 460             ~CallOnExit() { wxTheApp->OnExit(); }
 461         } callOnExit;
 462
 463         WX_SUPPRESS_UNUSED_WARN(callOnExit);
 464
 465         // app execution
 466         return wxTheApp->OnRun();
 467     }
 468     wxCATCH_ALL( wxTheApp->OnUnhandledException(); return -1; )
 469 }
 470
 471 #if wxUSE_UNICODE
 472
 473 // as with wxEntryStart, we provide an ANSI wrapper
 474 int wxEntry(int& argc, char **argv)
 475 {
 476     ConvertArgsToUnicode(argc, argv);
 477
 478     return wxEntry(gs_initData.argc, gs_initData.argv);
 479 }
 480
 481 #endif // wxUSE_UNICODE
 482
 483 // ----------------------------------------------------------------------------
 484 // wxInitialize/wxUninitialize
 485 // ----------------------------------------------------------------------------
 486
 487 bool wxInitialize(int argc, wxChar **argv)
 488 {
 489     wxCRIT_SECT_LOCKER(lockInit, gs_initData.csInit);
 490
 491     if ( gs_initData.nInitCount++ )
 492     {
 493         // already initialized
 494         return true;
 495     }
 496
 497     return wxEntryStart(argc, argv);
 498 }
 499
 500 void wxUninitialize()
 501 {
 502     wxCRIT_SECT_LOCKER(lockInit, gs_initData.csInit);
 503
 504     if ( --gs_initData.nInitCount == 0 )
 505     {
 506         wxEntryCleanup();
 507     }
 508 }